Plastic pipe chamfering tool

Abstract

A tool for chamfering the ends of plastic pipe of various diameters comprising a main body having various concentric circular grooves of different diameters which are shaped and sized to receive the square-cut ends of standard size plastic pipe. Each circular groove has an associated cutting blade mounted transversely with respect to the circumference of the pipe in a recess on the outer surface of the main body and positioned so that as the tool is rotated about the square-cut end of a pipe inserted in its correspondingly-sized groove, a chamfer is cut on the outer circular edge of the pipe. During the chamfering process, cuttings cannot enter the pipe because the open end of the pipe is covered by the tool and cuttings leave the tool through the recess. Cutting automatically ceases when the pipe end becomes seated in the groove.

What is claimed is: 
     
       1. A tool for chamfering square-cut ends of plastic pipe comprising: a main body having a first circular groove shaped and sized to receive a first size of plastic pipe;   a cutting blade mounted in a recess connecting the exterior surface of said main body with the periphery of said first groove; said blade being positioned transversely with respect to the circumference of a pipe of said first size inserted in said first groove;   said blade also being positioned and angled to cut a chamfer on the end of a pipe of said first size inserted in said first groove when said tool is axially rotated about said end and pressure is exerted on said tool in an axial direction toward said pipe end; and   said recess and blade being angled and positioned to expell cuttings from the chamfering process from said main body through said recess.     
     
     
       2. The tool of claim 1 wherein said main body is essentially radially symmetrical about a longitudinal axis, said body having two parallel faces at opposite ends of said longitudinal axis. 
     
     
       3. The tool of claim 2 wherein said first circular groove is formed on one of said two parallel faces, said first circular groove being radially symmetrical about said longitudinal axis. 
     
     
       4. The tool of claim 3 wherein said main body has at least one additional circular groove positioned concentrically with respect to said first groove on the same face with said first groove; each additional circular groove being sized and shaped to receive a different size of plastic pipe;   said main body having an additional recess and an additional blade mounted therein associated with each additional groove; and   said at least one additional circular groove and associated recess and associated blade being positioned to chamfer a pipe in a manner identical to that employed by said at least one blade and said at least one recess.   
     
     
       5. The tool of claim 3 wherein said main body has at least one additional circular groove on the opposite face; said at least one additional circular groove being radially symmetrical about said longitudinal axis;   each additional circular groove being sized and shaped to receive a different size of plastic pipe;   said main body having an additional recess and an additional blade mounted therein associated with each additional groove; and   said at least one additional circular groove and associated recess and associated blade being positioned to chamfer a pipe in a manner identical to that employed by said at least one blade and said at least one recess.   
     
     
       6. The tool of claim 3 wherein said main body has a chamber located in its hub, said chamber being shaped and dimensioned to receive spare cutting blades. 
     
     
       7. The tool of claim 6 which further comprises a threaded entrance to said chamber, and a threaded plug which may be screwed into said threaded entrance in order to retain said spare cutting blades within said chamber.